Mine-ventilator.



M. T. MUDONOUGH. MINE VENTILATOB.

APPLIOATION FILED MAY 5. 1909.

.MI M. M.

z SHEETS-SHEET 1'.

Patented Nov. 2, 1909.

M, T. MODONOUGH.

- MINE VENTILATOR.

ABPLIUATIOH FILED HAY 6, 1909. 938,781

` produce a Fig.- 4 is a diametrical section through the:

tions of tlieparts msnm fr. menoNoUen, or nimm, weer vincriire. AmNn-vENTILA'ron. A

En sinrus riafrnf Specification of Letters Patent.

Application tiled Hay 5, 1909. `Serial No. 494,121.

The primary object of the invention is a fau wheel which the shape andrelative position of the blades -Will impart to the fan a maximum degreeof volumetric and manometric eiiiciency, while at the saine timemaintaining a high mechanical etliciency retnlring a minimum of Power torotate it.

e invention also has' or its object a simple, durable and eilicientconstruction of fan wheel designed Ventilating of mines, altho li ap forotherp generally, e sai wheel embodying an inner and outer series ofblades so arranged with respectto each other that in the rotation of thefan the blade ci one series will back up the corresponding blade inadvance of it in the other series to ractically uniform and continuousiiow o air.v

With these and other objects in view, as will more ullyappear as thedescription proeeeds, themvention consists in certain constructions,arran ements and combinatat I-shall hereinafter fully describe andclaim.

For 7a full understanding of the invention, reference is to be had tothe followingdesoription and accompanying drawings in which: A A Figure1 is a side elevation of my iini proved fan wheel, a conventionalhousing be# ing shown, partly broken perspective view of a x'tion of onan enlar d scale, portion of wmgFa the blades o. the outer series ig. 3is a detailor fra enta perspective view of one of the hu s for t e wheelthe means for sec g' the h ub to thefinner ends of the radiating ribs orspokes, a portion of one of the same being shown in dotted lines;

wheel and housing and ,'Fig. 5 is `a fra inentary perspectivd view of a.blade of e mnernseries. Y

Corresponding and like parts 'are referred particularl for use in the ylicable present embodiment o away; Fi 2-is a 5.

e wheel' emb fand a relatively f otherwise secured at its inner edge totheI 'to in the V:following description and indi- Patented Nov. 2, 1909.

cated in all the views of the accompanying drawings by the samereference characters.

Referring to the drawings the numeral 1 designates the shaft of myimproved ventilating fan, said shaft -being journaled in any desired wayas in the pillow-blocks, on the up er -end of the standards 2, and beingprovided at either or both ends with a pulley 3 or other transmissionelement, connected as by a belt 4 or the like tosome driving part orsource of power (not shown). The two laterally spaced hubs .5 of thewheel are, ke ed or otherwise effectively held onthe sha l and arepreferably `provided with radially posed arms 6 that are preferably.cast therewith and that project beyendgthe periphery of the hub as bestillu trated in F .3. Theradia s okesiorri s'ofthe- 1g *mi P wheel arebolted or o erwise secured at their Y inner ends to these arms asindicated in Fig.

3, and are bolted or otherwise secured at their outer ends to outercircular rims 8 and at intermediate points to inner circular rims 9.Iifi the present instance there are twelve pairs o each other as clearlyillustrated in the drawings, although it is to be understood that ininvention'is not limited to this number of ri and that an desired numbermay be empio ed. The blades A of the outer series exten transversely homone side of the wheel to the oppositeside vand extend 'from the outercircumference of the outer rim to points slightly short of the outeredgesof the inner rims 9. Each blade of the outer series of blades iscurved outwardl in `opposite directions asbest illustratedl incurvatureof the opposite faces being .such as y to (produce the highestmanometric eiciency an g eii'ect. In the toavoi'd any dra the invention,the sheet steel and-each lade A is formed of odios a main Section 10that is curved ection to form acurved face for the blade,

v opiosite direction to formthe'oppositely curve Fig; 2, the

l slightly beyond its median line in an outward of the blade. The twosections areheld prop` erlyspa'ced from eachother-at their outer edgesby substantially V-shaped metallic 1 2 inte 'therebetweenandrivetedthereto :1t-intermediate 'oints in the length oftheblade, andthe sai sections riveted or .otherwise secured at their ends tosubstantially U-shaped or angular brackets 13 that are riveted orotherwise secured to the flanges 14. as best illustrate outer rims 8. Asnoted the outer ends of the ribs 7 are recessed along their outer edgesso as, to provide recesses Within which these brackets 13 fit.Preferably both outer and inner rims are constructed in any desirednumber of sections, held together by bolts extending through angularldisposed end d'in Fig. 2. V The outer edges of the blades A are securedin any desired wayto the ribs.

Referring to Fig. 5 wherein a blade B for4 the inner set of the bladesis illustrated, it will be understood that such blades are also providedwith oppositely curving faces that are formed in the present instance bymeans of two outwardly diverging sections 15 riveted together at theirinner edges which fit .Within recesses 16 in the hubs 5, between theribs 7. The outer edges of these sections 15 are held rigidly togetherin properly spaced relation by means of substantially V-shaped metallicstraps 17 riveted thereto at intermediate points and by brackets 18 VVattheir outer corners, said brackets embodying U- shaped body portionsthat are rivetedto the sections ofthe blades and connecting webs V19that are' riveted or otherwise secured to 'the inner rims 9.

It will be understood that in the preferred Y arrangement of partsthere-are one-half Yas many inner blades as there are Vouter blades, andthat theV inner blades are located in planes between the outer blades asclearly illustrated in Fig. 1, so that the currents of air set up bythe-revolutions of the outer blades will be followed up by similareurrents produced by the inner blades andV a substantiallycontinuous'and uniform ilow of air will be produced. For the purpose ofillustration only, I have shown as in Fig. 1, the wheel embodied in ahousing C which' is formed with a substantially ,tangentially disposedinlet onening 20 for the 4outer series of blades and with centrallydisposed eyes 21 at opposite sides for the inner set of bladesprlncipally, the casing or housing being also provided with -an outlettube 22 which is common to both sets of blades and which is designed tolead by a tunnel or the like to the mine'or other place to beventilated. While I have described the inletY as at 20 and the outlet asat 22, it is obvious that these terms are relative or arbitrary, as

it is clear that the' fan may be d to exhaust air from a mme or otherplal Aas welli -tinuous manner,

Vformed with oppositely curved faces,

oas-,1er

as supply fresh air, according to the direction' of rotation'Y of thefan wheel.

While as above stated, my invention is primarily designed for use insupplying mines w1th proper ventilation, and continued' A,

ous currents of pure air so that themen and animalsworking therein willnot suffer any inconvenience or inj urlous'eifects consequent upon foulor poisonous air, it is also designed in emergencies such as explosionsto exhaust the poisonous air and gases from a mine, and it is to beundeistood that the invention is applicable for Ventilating and otherpurposes generally where. it is desired to establish air currents. It isalso to be understood that ,my invention is not limited to the exactconstruction and arrangement of parts hereinbefore described andillustrated in the Vaccompanying drawings as various changes may be madein the proportions and con-- structions of the parts without departingfrom the scope of the invention as defined by the appended claims. f

Y The curvature of the opposite faces of the inner and outer blades notonly prevents the dragging effect that would be produced by plane faces,but-avoids to a Vrequisite extent the radial impact of the impulse ofair against the middle of the housing, the flow being thereby maintainedin a uniformY conthe continuity being largely the result of thel twoseries of blades, namely an inner series and an outer series, the bladesof one series following theV blades of the other series in. such' amanner that the current established will be unbroken and continuous.

Having thus described the invention, Awhat is claimed as new is:

l. A centrifugal fan wheel embodying an outer series of blades, an innerseries of blades, and a housing for said -Wheel provided With a side eyeleading to the inner series of blades, and with an independent admissionopening leading to the outer series of blades.

2. A centrifugal fan wheel, embodying an `outer series of blades, and aninner series'of blades, the said blades of both series beiiilg t eblades of the inner series alternating with the blades of the outerseries.V

fIn testimon whereof I aix my signature in presence o two witnesses.4

MARTIN T. ICDOEGUGH. [L s] Witnesses:

J. D. Yummy,-

Fnnnnniox S.

